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Physical and Chemical Changes

Physical and Chemical Changes. Unit II—Part 2. Concept of Change. Change: the act of altering a substance. Physical Change. Physical change: a change that occurs that does NOT change the substance Usually Reversible. Examples of Physical Change. Melting ice (change in state)

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Physical and Chemical Changes

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  1. Physical and Chemical Changes Unit II—Part 2

  2. Concept of Change • Change: the act of altering a substance

  3. Physical Change • Physical change: a change that occurs that does NOT change the substance • Usually Reversible

  4. Examples of Physical Change • Melting ice (change in state) • Freezing Kool-Aid • Tearing paper • Breaking Glass

  5. Chemical Changes • Chemical change: a change that occurs causing the substance to change • Is NOT reversible • A chemical change is called a chemical reaction

  6. Examples of Chemical Changes • Burning • Digesting food • Reacting with other substances

  7. Chemical Changes Cont’d • Signs of a chemical change: • Light • Heat • Gas • Colour change* • Formation of a precipitate (solid made from mixing 2 liquids)

  8. Is it Physical or Chemical?

  9. References • Investigating Science Pearson 9 • Dercho

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